Which of the following statements concerning lattice energy is false? It is ofte

Question

Which of the following statements concerning lattice energy is false? It is often defined as the energy released when an ionic compound forms from its ions. MgO has a higher lattice energy than NaF. In the Lewis structure for elemental nitrogen, there is (are) a single bond between the nitrogen atoms a double bond between the nitrogen atoms a triple bond between the nitrogen atoms three unpaired electrons two unpaired electrons, one on each nitrogen What is the geometry of PH_2? An element has an electronic configuration of [Kr]5s^2 4d^10 5p^2 The element is a(n) What is the electronic configuration for yttrium?

Explanation / Answer

1. All of the above statements for lattice energy are correct except option ‘c’.

2. Lewis structure for N2 is as follows,

Nitrogen has 5 valence electrons, the 3 electrons from each will form a triple bond, leaving a remaining lone pair on each Nitrogen, :NN:

3. PH3 molecule has the central f phosphorus atom connected via single bonds to three hydrogen atoms. The phosphorus atom also has one pair of unshared electrons. The electron-cloud geometry of the phosphorus atom is tetrahedral, but the PH3 molecular geometry is trigonal pyramidal.

4. Given that electronic configuration of element is [Kr]5s24d105p2. If we calculate atomic number by writing down whole configuration atomic number comes to 50, therefore it is Sn metal(Tin). It cannot be a transition metal because d orbital is completely filled and also it is not from lanthanide and actinide groups as those elements are heavy, large and more d and e orbitals.

Additionally it cannot be a non-metal as well because they are small and have very less d and p orbitals. Hence we can conclude that it is a meta

5. Electronic configuration of yettrium (Y) is Kr 4d1 5s2 with atomic number 39. It is chemically similar to lanthanides and also classified as rare earth element.

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